[英]Angular2 HTTP request fails
This is my first question here. 这是我的第一个问题。 I have a problem with the http requests on an API. 我在API上的http请求有问题。 When I make the request, the following error shows up on the console: 当我发出请求时,控制台上会显示以下错误:
EXCEPTION: Cannot find a differ supporting object '[object Object]' of type 'object'. 例外:找不到类型为“对象”的其他支持对象“ [对象对象]”。 NgFor only supports binding to Iterables such as Arrays. NgFor仅支持绑定到Iterables,例如数组。
The content of each files is: 每个文件的内容是:
boot.ts 引导程序
import {bootstrap} from 'angular2/platform/browser';
import {AppComponent} from "./app.component";
import {HTTP_PROVIDERS} from "angular2/http";
bootstrap(AppComponent,[HTTP_PROVIDERS]);
app.component.ts app.component.ts
import {Component} from 'angular2/core';
import {HTTPTestService} from "./services/peli.service";
import {Peli} from "./peli";
@Component({
selector: 'my-app',
template: `
<h1>Búsqueda de película</h1>
<input #titulo placeholder="Buscar...">
<button class="btn btn-success" (click)="infoPeli(titulo.value)">Buscar</button>
<div *ngFor="#peli of pelis">
<h1>{{peli.Title}}</h1>
<p>{{peli.Year}}</p>
</div>
`,
providers: [HTTPTestService]
})
export class AppComponent {
pelis:Peli[];
constructor (private _httpService: HTTPTestService) {}
infoPeli(nombre:string) {
this._httpService.buscarPeli(nombre)
.subscribe(
data => this.pelis = data,
error => alert(error),
() => console.log(this.pelis)
);
}
}
peli.service.ts 维护服务
import {Injectable} from "angular2/core";
import {Http} from "angular2/http";
import 'rxjs/add/operator/map';
@Injectable()
export class HTTPTestService {
constructor(private _http:Http) {
}
buscarPeli(nombre:string) {
return this._http.get('http://www.omdbapi.com/? t='+nombre+'&y=&plot=short&r=json').map(res => res.json());
}
}
peli.ts 资质
export class Peli{
Title:string;
Year:string;
}
And the JSON file that I receive from the request (Input - spiderman): 以及我从请求中收到的JSON文件(输入-Spiderman):
{"Title":"Spiderman","Year":"1990","Rated":"N/A","Released":"N/A","Runtime":"5 min","Genre":"Short","Director":"Christian Davi","Writer":"N/A","Actors":"N/A","Plot":"N/A","Language":"German","Country":"Switzerland","Awards":"N/A","Poster":"N/A","Metascore":"N/A","imdbRating":"5.7","imdbVotes":"90","imdbID":"tt0100669","Type":"movie","Response":"True"}
I don't know where the problem is, everything seems to be OK... 我不知道问题出在哪里,一切似乎都还可以。
Thanks in advance!! 提前致谢!!
You have an <div *ngFor="#peli of pelis">
element. 您有一个<div *ngFor="#peli of pelis">
元素。 And you are setting this.pelis
to be an object here => 并且您将this.pelis
设置为此处的对象=>
.subscribe(
data => this.pelis = data,
And you are getting an 你得到一个
EXCEPTION: Cannot find a differ supporting object '[object Object]' of type 'object'. 例外:找不到类型为“对象”的其他支持对象“ [对象对象]”。 NgFor only supports binding to Iterables such as Arrays. NgFor仅支持绑定到Iterables,例如数组。
Since pelis is not an array you are getting this error. 由于pelis不是数组,因此会出现此错误。
For example: Instead of 例如:代替
data => this.pelis = data
Try: 尝试:
data => this.pelis = [data]
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